We have been on that ship three times but not in a BB, the wife likes S. On any of today’s cruise ships they have stabilizers which eliminates most pitch and roll. I have never felt vibration; again on the newer ships they are very careful to eliminate such distractions. I think you have a great cabin on a great ship and you should enjoy yourself immensely.
We had a BB cabin at the very back of the ship. Larger than normal balcony but two BIG drawbacks. No problems with pitch and roll, but the vibration from the docking jolted us out of bed at every port. Thought we'd get to sleep in on sea days but no luck since the pool attendants slapped pool deck chair after chair onto the aft pool deck. Also noisy when all those chairs were being put away in the evening. But almost every cabin can have some drawbacks, too close to elevators or to the disco, etc. The large balcony was great and my husband, a great sleeper, wasn't bothered by the noise and vibration at all. It's all in your point of view.